twinning (root: twin)

POS

Verb (intransitive), Verb (transitive)

HYPHEN

twin=ning

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WORDNET DICTIONARY

Adjective twinning has 1 sense

twinning(s = adj.all) biparous - producing two offspring at a time;

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CIDE DICTIONARY

twinning, n.

The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about. [1913 Webster]

Polysynthetic twinning, repeated twinning of crystal lamellæ, as that of the triclinic feldspars. -- Repeated twinning, twinning of more than two crystals, or parts of crystals. -- Twinning axis, Twinning plane. See the Note under Twin, n.